Platform Leveling Up Function Inoperative - JLG T350 Troubleshooting Manual

SECTION 1 - TROUBLESHOOTING BY FUNCTION

1.19 PLATFORM LEVELING UP FUNCTION INOPERATIVE

Step Pretest Instructions
1.19.1
1.19.2 Engage enable and Level Up
switch
1.19.3 Install a 0 to 5000 PSI (345
bar) pressure gauge at the
manifold G port
1.19.4 Plumb a 0 to 5000 PSI (345
bar) pressure gauge into the
manifold P port
1.19.5 Put boom in transport and
activate Platform Level Down
to relieve pressure. Some
working pressure will still be in
the line. Install a 0 to 5000 PSI
(345 bar) pressure gauge at
the manifold GA port
1-38
Test
Basic check of likely causes
DC - Is pump motor running?
Gas - Is engine running at high
idle
Engage the enable and Level
Up switch. Check the pressure.
Engage the enable and Level
Up switch. Check pressure at
manifold P port
Engage the enable and Level
Up switch. Check pressure at
manifold GA port. Relieve the
pressure before removing the
gauge.
T350 T500J
Result
Yes
No
Yes
No
Above Min. Level Up Pressure psi
(bar)
Below Min. Level Up Pressure psi
(bar)
Above Min. Level Up Pressure psi
(bar)
Below Min. Level Up Pressure psi
(bar)
Above Min. Level Up Pressure psi
(bar)
Below Min. Level Up Pressure psi
(bar)
Corrective Action
Possible Causes: 4.1.32, 4.1.33,
4.1.37
Go to step 1.19.3
See 1.2 Pump Motor Will Not Operate -
DC Powered Models
Go to step 1.19.3
See 1.8 Engine High Idle Inoperative -
Engine Models
Go to step 1.19.5
Go to step 1.19.4
Possible Causes: 4.1.38, 4.1.45,
4.1.74, 4.1.40, 4.1.10, 4.1.43
Possible Causes: 4.1.46, 4.1.47,
4.1.74, 4.1.45, 4.1.39, 4.1.10
Possible Causes: 4.1.49, 4.1.48,
4.1.41
Possible Causes: 4.1.42, 4.1.55,
4.1.44, 4.1.54
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